Table 1 Demographics and the frequency of atypical findings

Sex

 Female

332 (55%)

 Male

274 (45%)

Age

56 (42, 69)^b

Atypical findings

355 (59%)

Isolated upper lobe involvement

10 (1.7%)

Solitary involvement

17 (2.8%)

Peribronchovascular involvement

43 (7.1%)

Lobar consolidation

3 (0.5%)

Tree in bud pattern

3 (0.5%)

Centrilobular nodules

13 (2.1%)

Pleural effusion

39 (6.4%)

Pleural thickening

103 (17%)

Pericardial effusion

18 (3.0%)

Subpleural sparing

29 (4.8%)

White lung

15 (2.5%)

Halo sign

42 (6.9%)

Reverse halo sign

59 (9.7%)

Double halo sign

1 (0.2%)

Target shaped opacity

28 (4.6%)

Lymphadenopathy

29 (4.8%)

Cavitation

0 (0%)

Air bubble sign

14 (2.3%)

Airway changes

102 (17%)

Age group

 (0, 40 yrs]

145 (24%)

 (40, 60 yrs]

208 (34%)

 (more than 60 yrs)

253 (42%)